1. Frahm H. Device for damping vibrations of bodies. U.S. patent No. 989958; 1911.
2. The theory of the dynamic vibration absorber;Ormondroyd;J Appl Mech,1928
3. Mechanical vibrations;Den Hartog,1956
4. A note on the damped vibration absorber;Brock;J Appl Mech,1946
5. Frequency analysis of the tuned mass damper;Krenk;J Appl Mech ASME,2005